They did address the concerns. They are giving people an entire month to make the needed changes to their most popular heads before they get taken off-sale, and then giving people another 4 months after that to fix their less popular heads that got taken off-sale. And even after that they will likely port the rest of the heads themselves.
When they add this update it will allow for future updates that will let users sell layered makeup and layered hair with the knowledge that the lipstick they make will work on every mouth, and that the beards they make will fit on every head.
If you look here
The minimum amount of expression that roblox is enforcing is not very high. Its not hard to reach their guidelines while keep the faces close to the original product.